public class e3_7{
 public static void main(String args[]){
    int sum=0,i,j;
    for(i=1;i<=10;i++){
       
	if(i%2==0){
	continue;
 	}
	sum=sum+i;
	}

	System.out.println("sum="+sum);
	for(j=2;j<=5230;j++){
	  for(i=2;i<=j/2;i++){
	    if(j%i==0)
	  break;
	}
	if(i>j/2) {
	  System.out.println(""+j+"是素数");
		}
	}
	}
  }
